[PATCH] thermal: rcar: check for NULL return of of_match_device

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

of_match_device can potentially return NULL, so we need to check for
this case to avoid a null pointer dereference on of_id

Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/thermal/rcar_thermal.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 0e735ac..5943881 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -431,13 +431,17 @@ static int rcar_thermal_probe(struct platform_device 
*pdev)
        struct device *dev = &pdev->dev;
        struct resource *res, *irq;
        const struct of_device_id *of_id = of_match_device(rcar_thermal_dt_ids, 
dev);
-       unsigned long of_data = (unsigned long)of_id->data;
+       unsigned long of_data;
        int mres = 0;
        int i;
        int ret = -ENODEV;
        int idle = IDLE_INTERVAL;
        u32 enr_bits = 0;
 
+       if (!of_id)
+               return ret;
+       of_data = (unsigned long)of_id->data;
+
        common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
        if (!common)
                return -ENOMEM;
-- 
2.7.0